Redoing the subsequent operation

The "Redo" menu text will change to show the next operation in the undo history.

TreeDraw remembers what the chart looked like before the last operation you carried out, so if you decide that was not what
you really wanted to do, you can undo it. If you then decide that you did want to
carry out the operation after all, use this function to redo it.

You can set the number of undo levels which TreeDraw can store in "Options | Preferences | General".
Set the number of undo levels to zero to disable the undo/redo feature.